Resolve "Editing the title of a MR creates a new link to jira"

What does this MR do?

It fixes the problem with duplicate links on Jira when editing the title of a MR and it also updates the link's title and comment.

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #25373 (closed)

/cc @smcgivern